Say, like, an Arduino's Analog 4&5 pins for i2c's CLK and DAT are punted into two of the XBee's DIO pins. Then, the remote XBee's DIO pins can be plopped into the back of the Adafruit Mini 8x8 LED I2C Backpack along with a battery. I'd imagine on the Arduino side, the XBee would require Adafruit's XBee Adapter kit to step the voltage down.

Can the XBee's DIO pins be twaggled quickly enough to pass i2c wirelessly? Imagining an itty bitty stand-alone battery-powered wireless LED matrix display controlled from a remote Arduino/computer, using XBee's DIO pins as the glue.

"When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you" - Pablo Picasso